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08-22-2007
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trying to add a second battery to my o-day
what is the best way to add more battery power i have one on board now it is fine for day sailing but for longer trips it gets weak
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08-22-2007
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Wandering Aimlessly
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What size boat are you talking about? Inboard diesel or outboard? What size is the current battery?
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John
Ontario 32 - Aria
Free, is the heart, that lives not, in fear.
Full, is the spirit, that thinks not, of falling.
True, is the soul, that hesitates not, to give.
Alive, is the one, that believes, in love. JCP
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08-22-2007
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Probably the hardest part will be finding a location to place the second battery.
After you have found a location for it, Parrellel it to the first and you have doubled your Ah. Probably best if you make sure both batteries are of the same type and amps.
Others may be of more help, but I have three group 27's parrelleled with 90 amps each for a total of 270 amp.
Edit: We are talking about a house bank correct?
Do you have a seperate starting battery?
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If a man is to be obsessed by something, I suppose a boat is as good as anything, perhaps a bit better than most - E.B. White
Last edited by sailortjk1; 08-22-2007 at 09:43 AM.
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08-22-2007
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Telstar 28
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More information rather than less is more useful in general when asking for advice.
What boat do you have?
What batteries do you have aboard currently?
What kind of charging system do you have aboard?
Do you dock the boat at a dock with shorepower?
How long do you normally go out for?
What is your average daily usage?
BTW, if you're increasing your house battery bank, it might be wiser, especially if the current battery is older, to replace it at the same time. Otherwise it can shorten the life of the newer batteries. YMMV.
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Sailingdog
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Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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08-22-2007
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i have a 25 o-day with an out board with a single with 500 amps can i add a second 500 amp i have room next to the existing battery i just replaced the house battery july 3rd
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08-22-2007
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Wandering Aimlessly
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What matters is amp hours, not amps. What you need are deep cycle batteries, and the means to charge them. To add a second battery, you should have a similar sized and type battery, wired negative to negative, positive to positive, then run the postive lead to the boat from one battery and the negative from the other battery to the boat.
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John
Ontario 32 - Aria
Free, is the heart, that lives not, in fear.
Full, is the spirit, that thinks not, of falling.
True, is the soul, that hesitates not, to give.
Alive, is the one, that believes, in love. JCP
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08-22-2007
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Sounds like your outboard doesn't charge the house battery. If so, it may make more sense to consider ways to charge it when cruising rather than just adding another battery. Choices would include an outboard with an alternator, solar panels, a portable generator with 12V output, or wind generator. I like the first option. I cruised for many years on a Pearson 26 with a single deep cycle battery charged by the 8 HP Johnson outboard. Plenty of power for lights, VHF and instruments for 2-3 week cruises.
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08-22-2007
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It's a deep cycle battery now. So I can just put two of them in series? We have a solar charger but its a trickle two amp charger.
Thanks, David
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08-22-2007
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No NOT in series.
Parrellel, like Pbzeer said, Neg to Neg; pos to pos..
If you wire in series you double your voltage.
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Courtney is My Hero
If a man is to be obsessed by something, I suppose a boat is as good as anything, perhaps a bit better than most - E.B. White
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08-22-2007
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Trim for Sail
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there is a simple diagram on this page, scroll down. eliminate the outboard and you got it. i dont have an alternator on my OB either. i use solar.
Link
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